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PCI-e 16x vs 4x

post #1 of 13
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I recently put an AsRock pt880 pro motherboard in for a customer and now that he wants to upgrade his AGP graphics card to an 8800gt, he discovered that the PCI-e slot only runs at 4x. Is there a huge difference between 4x and 16x? Will this card run on this board at all?

The question really should be, why the hell is Newegg advertising this board as having a 16x slot when it only runs at 4x?
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post #2 of 13
There is not a huge difference in the bus speed (because of what the card utilize) but there is a difference in the compatible cards that will run on each platform. AGP is very old and not may good cards are made on it anymore.

I looks like your customer was going for the cheapo of the cheapo so if he wants to go Pci-e he will have to upgrade to a better board.

AGP and Pci-e are completely different and a card made for one will NOT work for the other.

edit: I looks like this board has BOTH Agp and Pci-e. If he buys a pci-e card it should work with proper drivers. Sorry for the wrong information previously.
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post #3 of 13
It's a physical 16x slot so that's more important since it will run any PCIe card.

The 8800GT will be bandwidth bottlenecked in a 4x though,
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post #4 of 13
it should work. how fast I can't answer that though. as far as why they advertise it as a 16x slot is I assume being it is a 16x slot as far as the size goes. it just isn't wired as a 16x slot. I know it doesn't help much but at least it is a little info
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post #5 of 13
try turning your video card down to 4x and see if you notice a difference
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post #6 of 13
Quote:
Originally Posted by drjoey1500 View Post
try turning your video card down to 4x and see if you notice a difference
How?
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post #7 of 13
Newegg says it is a 16x slot, not that it runs at 16x.
The Asrock web site states the PCI- runs only @ 4x.

The 16x card will work, just not to it's full potential. Depending on what AGP card he is replacing, PCI-e may be the same as the AGP.
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post #8 of 13
Quote:
Originally Posted by DuckieHo View Post
How?
well im not sure...never used nvidia, but with my ati agp card i can choose whether to run it on 4x or 8x in the ccc.
im sure theres a way...help me out nvidia pcie users
maybe in bios (wild guess) most likely in driver settings.
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post #9 of 13
Thread Starter 
Quote:
Originally Posted by Gollie View Post
There is not a huge difference in the bus speed (because of what the card utilize) but there is a difference in the compatible cards that will run on each platform. AGP is very old and not may good cards are made on it anymore.

I looks like your customer was going for the cheapo of the cheapo so if he wants to go Pci-e he will have to upgrade to a better board.

AGP and Pci-e are completely different and a card made for one will NOT work for the other.

edit: I looks like this board has BOTH Agp and Pci-e. If he buys a pci-e card it should work with proper drivers. Sorry for the wrong information previously.
That's cool. That is the very reason I got the board for him in the first place. He has a top of the line ATI AGP video card, and wanted to use that for awhile until he could get up enough money to buy a PCI-e. The board also supports DDR and DDR2 memory, so he was able to utilize his current memory as well, until he upgraded.

It seemed like a great choice at the time, and it fit into his budget. I feel like a dope for recommending this board now.


Quote:
Originally Posted by drjoey1500 View Post
try turning your video card down to 4x and see if you notice a difference
I'm going to try that. This Lanparty board has more tweaking options than the entire OCN folding team would know what to do with. If it can be done, I'm sure this board can do it.
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by drjoey1500 View Post
well im not sure...never used nvidia, but with my ati agp card i can choose whether to run it on 4x or 8x in the ccc.
im sure theres a way...help me out nvidia pcie users
maybe in bios (wild guess) most likely in driver settings.
I just looked all over my BIOS and I couldn't find a way. It probably cannot be done with PCI-e. I wonder if I could make the card only run at 4x using nTune or RivaTuner.

To hell with it. I just think I'll RMA the damn thing back to Newegg. This will be the third board in two weeks for me. I gotta start talking customers into buying better boards because this is really taking a toll on my time at work. It's just not worth it to use :turd:
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